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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_ASH_ARC_TRACING_PRESENT_FRAMES_TRACER_H_
#define CHROME_BROWSER_ASH_ARC_TRACING_PRESENT_FRAMES_TRACER_H_
#include <deque>
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "components/exo/surface_observer.h"
#include "ui/gfx/presentation_feedback.h"
namespace exo {
class Surface;
} // namespace exo
namespace arc {
// Traces commits and, more importantly, frame presentation events, which
// enables perceived FPS measurement.
// Stores timestamps in tick counts (microseconds) accumulated over the course
// of a trace. Backed by deques to give O(1) non-amortized insertion time.
class PresentFramesTracer {
public:
PresentFramesTracer();
~PresentFramesTracer();
// Prevent accidental copying.
PresentFramesTracer(const PresentFramesTracer&) = delete;
PresentFramesTracer& operator=(const PresentFramesTracer&) = delete;
// Record a commit as having occurred at the given time.
void AddCommit(base::TimeTicks commit_ts);
// Record a present as having occurred at the given time. Ideally you would
// use ListenForPresent, but for detached displays the present event may never
// occur, but we still want to consider it as if it happened for performance
// metrics and testing.
void AddPresent(base::TimeTicks present_ts);
// Record the next frame presented event on the given surface. This can be
// called from within SurfaceObserver::OnCommit.
void ListenForPresent(exo::Surface* surface);
const std::deque<int64_t>& commits() const { return commits_; }
const std::deque<int64_t>& presents() const { return presents_; }
private:
void RecordPresentedFrame(const gfx::PresentationFeedback& frame);
std::deque<int64_t> commits_, presents_;
base::WeakPtrFactory<PresentFramesTracer> weak_ptr_factory_;
};
} // namespace arc
#endif // CHROME_BROWSER_ASH_ARC_TRACING_PRESENT_FRAMES_TRACER_H_
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